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Lines of Credit and Debt (Schedule of Total Debt Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Notes Payable, 6.28% Interest Rate, Due Through November 2015 [Member] | Dec. 31, 2011 Notes Payable, 6.28% Interest Rate, Due Through November 2015 [Member] | Dec. 31, 2012 Senior Unsecured Notes [Member] Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member] | Oct. 12, 2012 Senior Unsecured Notes [Member] Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member] | Dec. 31, 2012 Senior Unsecured Notes [Member] Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member] | Oct. 12, 2012 Senior Unsecured Notes [Member] Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member] | Dec. 31, 2012 Senior Unsecured Notes [Member] Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member] | Oct. 12, 2012 Senior Unsecured Notes [Member] Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member] | Dec. 31, 2012 QIAGEN Euro Finance [Member] Convertible Notes 3.25% Due in 2026 [Member] | Dec. 31, 2011 QIAGEN Euro Finance [Member] Convertible Notes 3.25% Due in 2026 [Member] | May 31, 2006 QIAGEN Euro Finance [Member] Convertible Notes 3.25% Due in 2026 [Member] | Dec. 31, 2012 QIAGEN Finance [Member] Convertible Notes 1.5% Due in 2024 [Member] | Dec. 31, 2011 QIAGEN Finance [Member] Convertible Notes 1.5% Due in 2024 [Member] | Aug. 31, 2004 QIAGEN Finance [Member] Convertible Notes 1.5% Due in 2024 [Member]
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.70% |  |  | 1.80% |  |
Total long-term debt | $ 846,992 | $ 447,622 | $ 1,992 | $ 2,622 | $ 73,000 |  | $ 0 | $ 300,000 |  | $ 0 | $ 27,000 |  | $ 0 | $ 300,000 | $ 300,000 |  | $ 145,000 | $ 145,000 |
Less current portion | 948 | 1,617 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term portion | $ 846,044 | $ 446,005 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  | 6.28% |  | 3.19% | 3.19% |  | 3.75% | 3.75% |  | 3.90% | 3.90% |  |  |  | 3.25% |  |  | 1.50%

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